Gu Yingying, Liu Yingjie, Tong Yunwei, Qin Zhenbo, Wu Zhong, Hu Wenbin
Tianjin Key Laboratory of Composite and Functional Materials, Key Laboratory of Advanced Ceramics and Machining Technology (Ministry of Education), School of Materials Science and Engineering, Tianjin University, Tianjin 300072, China.
Joint School of National University of Singapore and Tianjin University, International Campus of Tianjin University, Fuzhou 350207, China.
Nanomaterials (Basel). 2022 Apr 13;12(8):1336. doi: 10.3390/nano12081336.
The application of NaCl-based aluminum-air batteries is limited due to the passivation of the aluminum anode. In an effort to solve this problem, this work studied the influence of different concentrations of Ga additives on the discharge behavior of Al in the NaCl electrolyte. The results of both experiments and theoretical calculations have shown that commercial purity aluminum could be significantly activated by Ga. Based on microstructure observations and electrochemical impedance spectroscopy, the influence activation mechanism of Ga on the discharge behavior of commercial purity Al is clarified. The addition of Ga biased the surface charge of aluminum along the activation direction, forming activation sites, and then destroyed the surface passivation film. Due to the formation of a gallium-aluminum amalgam, the Al-air battery had the best discharge characteristics in the electrolyte with 0.2 M Ga, and its discharge voltage reached 0.9734 V with a remarkable increase compared with that of NaCl solution (0.4228 V). Therefore, Ga additive is a promising choice for NaCl-based Al-air batteries to improve their discharge voltage.
基于氯化钠的铝空气电池的应用因铝阳极的钝化而受到限制。为了解决这一问题，本研究探讨了不同浓度的镓添加剂对铝在氯化钠电解液中放电行为的影响。实验和理论计算结果均表明，商业纯铝可被镓显著活化。基于微观结构观察和电化学阻抗谱，阐明了镓对商业纯铝放电行为的影响活化机制。镓的加入使铝表面电荷沿活化方向偏移，形成活化位点，进而破坏表面钝化膜。由于形成了镓铝汞齐，铝空气电池在含0.2 M镓的电解液中具有最佳放电特性，其放电电压达到0.9734 V，与氯化钠溶液（0.4228 V）相比显著提高。因此，镓添加剂是提高基于氯化钠的铝空气电池放电电压的一个有前景的选择。
